抑癌基因PTEN与PIP3、细胞周期蛋白D1在口腔鳞癌中的表达及其相关性分析

Expression of tumor suppressor gene PTEN,PIP3 and cyclin D1 in oral squamous cell carcinoma and their correlations

目的通过检测口腔鳞癌及癌前病变中抑癌基因与张力蛋白同源10 q丢失的磷酸酶基因(PTEN)、3、4、5-三磷酸磷脂酰肌醇(PIP3)、细胞周期蛋白D1(cyclin D1)的表达,分析其相关性,初步探讨在口腔鳞癌中PTEN可能的作用途径。方法采用免疫组化SP法检测63例口腔鳞癌、29例单纯增生、33例异常增生、25例正常口腔黏膜中PTEN、PIP3、cyclin D1的表达。结果PTEN在口腔鳞癌中阴性和弱阳性表达占25％,明显低于其他各组;PIP3在单纯增生、异常增生和口腔鳞癌中阳性或强阳性表达分别占66％、64％和76％,明显高于正常组的表达;cyclin D1在口腔鳞癌中阳性或强阳性表达的占49％,明显高于其他各组。PTEN与PIP3、cyclin D1之间呈负相关,PIP3与cyclin D1呈正相关。结论PTEN在口腔鳞癌的发生和发展过程中起着一定的作用;在口腔鳞癌中PTEN可通过下调PIP3,继而下调cyclin D1,从而抑制细胞的生长。

Objective To detect the expression of PTEN, PIP3 and cyclin D1 in oral squamous cell carcinoma and precancerous lesions and analyze their correlation. Methods Immunohistochemistry SP method was used to detect the expression of PTEN, PIP3 and cyclin D1 in 63 cases of oral squamous cell carcinoma, 29 cases of simple hyperplasia, 33 cases of dysplasia, and 25 cases of normal oral mucosa. Results The negative or low expression of PTEN in oral squamous cell carcinoma was 25%, which was remarkebly lower than that in other groups. The positive expression of PIP3 in simple hyperplasia, dysplasia and oral squamous cell carcinoma was 66%, 64% , and 76% respectively, which were much higher than those in nomal oral mucosa. The positve expression of cyclin D1 in oral squamous cell carcinoma was 49%, which was significantly higher than that in other groups. The negative correlation between PTEN with PIP3, cyclin D1 and the positive correlation between PIP3 and cyclin D1 were observed. Condusions PTEN may play a role in the oncogenesis of oral squamous cell carcinoma, and PTEN may down-regulate the expression of PIP3, and then down-regulate the expression of cyclin D1, which leads to the suppression of cell growth.